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Title: Electronic excitation of CO by positron impact

Abstract

We report calculated cross sections for the electronic excitation of carbon monoxide by positron impact. The calculations were carried out with the Schwinger multichannel method and included six collision channels, namely the ground (X {sup 1}{sigma}{sup +}) and five electronically excited (A {sup 1}{pi}, I {sup 1}{sigma}{sup -} and D {sup 1}{delta}) states. Present calculated excitation cross sections to the A {sup 1}{pi} state did not present any resonant features, being in this sense consistent with previous calculations for the isoelectronic nitrogen molecule. The experimental a {sup 1}{pi}{sub g} excitation cross section of N{sub 2} presented a resonantlike structure which would also be expected in the A {sup 1}{pi} excitation of CO. We discuss possible reasons for the disagreement between experiment and theory.

Authors:
; ;  [1];  [2]
  1. Departamento de Fisica, Universidade Federal do Ceara, 60455-760 Fortaleza, Ceara (Brazil)
  2. (UNICAMP), 13083-970 Campinas, Sao Paulo (Brazil)
Publication Date:
OSTI Identifier:
20786314
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevA.72.062715; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CARBON MONOXIDE; CROSS SECTIONS; EXCITATION; EXCITED STATES; GROUND STATES; MOLECULES; NITROGEN; POSITRON-MOLECULE COLLISIONS; POSITRONS

Citation Formats

Silva, Euclimar P. da, Varella, Marcio T. do N, Lima, Marco A. P., and Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas. Electronic excitation of CO by positron impact. United States: N. p., 2005. Web. doi:10.1103/PHYSREVA.72.0.
Silva, Euclimar P. da, Varella, Marcio T. do N, Lima, Marco A. P., & Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas. Electronic excitation of CO by positron impact. United States. doi:10.1103/PHYSREVA.72.0.
Silva, Euclimar P. da, Varella, Marcio T. do N, Lima, Marco A. P., and Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas. Thu . "Electronic excitation of CO by positron impact". United States. doi:10.1103/PHYSREVA.72.0.
@article{osti_20786314,
title = {Electronic excitation of CO by positron impact},
author = {Silva, Euclimar P. da and Varella, Marcio T. do N and Lima, Marco A. P. and Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas},
abstractNote = {We report calculated cross sections for the electronic excitation of carbon monoxide by positron impact. The calculations were carried out with the Schwinger multichannel method and included six collision channels, namely the ground (X {sup 1}{sigma}{sup +}) and five electronically excited (A {sup 1}{pi}, I {sup 1}{sigma}{sup -} and D {sup 1}{delta}) states. Present calculated excitation cross sections to the A {sup 1}{pi} state did not present any resonant features, being in this sense consistent with previous calculations for the isoelectronic nitrogen molecule. The experimental a {sup 1}{pi}{sub g} excitation cross section of N{sub 2} presented a resonantlike structure which would also be expected in the A {sup 1}{pi} excitation of CO. We discuss possible reasons for the disagreement between experiment and theory.},
doi = {10.1103/PHYSREVA.72.0},
journal = {Physical Review. A},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}